Slide 16 of 42
Let's get another look at those parametric curves since we're going to
be seeing a lot more of them. Remember that our goal is to find the
data values that reliably correspond to the middle of a boundary. So
in answer to the question, "where's the boundary", we can say "here",
at the data value corresponding to the max in f', or here, at the data
value corresponding to the zero-crossing in f''. There's also a way
to integrate these two plots into one picture.